trillion

noun

tril·​lion ˈtri(l)-yən 

1

: a number equal to 1,000 times one billion see Table of Numbers

2

: an indeterminately large number

a trillion mosquitoes out tonight

trillion adjective

trillionth

ˈtri(l)-yən(t)th 

adjective or noun

Examples of trillion in a Sentence

Recent Examples on the Web

Every prompt, response, and autonomous agent interaction consumes tokens, and as AI systems become more sophisticated, usage can scale from thousands to millions—or even trillions—of tokens. — Sheryl Estrada, Fortune, 29 July 2026

With the region’s trillions of dollars in sovereign wealth assets and large foreign exchange reserves, most Gulf states make for creditworthy borrowers. — Mohammed Sergie, semafor.com, 29 July 2026

Bank of America's payments chief Mark Monaco has noted that clients are not beating down the door for tokenized deposits, at the same bank whose CEO sizes the deposit threat in the trillions. — Zennon Kapron, Forbes.com, 28 July 2026

During training, the model ingests vast amounts of text and other data while an algorithm adjusts billions or trillions of numerical dials—the weights—until the system can predict and eventually generate humanlike content. — Jacek Krywko, Scientific American, 23 July 2026

Word History

Etymology

French, from tri- + -illion (as in million)

First Known Use

1745, in the meaning defined at sense 2

Rhymes for trillion

• billion
• million
• pillion
• castilian
• civilian
• cotillion
• pavilion
• postilion
• quadrillion
• reptilian
• vermilion
• vermillion

Kids Definition

trillion

noun

tril·​lion ˈtril-yən 

1

: a number equal to 1,000 times one billion see number

2

: a very large number

a trillion mosquitoes out tonight

trillion adjective

trillionth

-yən(t)th 

adjective

trillionth noun